<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
      </el-alert> 
      <!-- 步骤条 -->
      <el-steps :active="activeIndex - 0" align-center finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tabs区 -->
      <!-- tabs与tab-pane 必须为父子关系 -->
      <!--  -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
      label-width="100px" label-position="top">
        <el-tabs tab-position='left' v-model="activeIndex"
         :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">

              <!-- form-item -->
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>

              <el-form-item label="商品分类" prop="goods_cat">
                <!-- 级联选择器 -->
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="catelist"
                  expand-trigger='hover'
                  :props="cateProps"
                  @change="handleChange">
                </el-cascader>
              </el-form-item>

          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item v-for="item in manyTableData" :key="item.attr_id"
            :label="item.attr_name">
                <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
             <!-- 渲染表单的item项 -->
            <el-form-item v-for="item in onlyTableData" :key="item.attr_id"
            :label="item.attr_name">
                <!-- input -->
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 上传图片 -->
            <!-- action 图片要上传到的后台接口地址（图片传到哪里去）   -->
            <!-- on-preview  图片预览事件     :on-remove 单击叉号时触发(移除图片)  -->
            <!-- :headers  为upload组件手动绑定请求头 -->
            <el-upload
            :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove"
            list-type="picture"
            :headers="headerObj"
            :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加按钮 --> 
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>



    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>

  </div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
    return {
      // 步骤条默认为’基本信息‘
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []

      },
      // 添加商品的表单校验对象
      addFormRules:{
        goods_name: [
          {
            required: true, message: '请输入商品名称',
            trigger: 'blur'
          }
        ],   
        goods_price: [
          {
            required: true, message: '请输入商品价格',
            trigger: 'blur'
          }
        ],   
        goods_weight: [
          {
            required: true, message: '请输入商品重量',
            trigger: 'blur'
          }
        ],   
        goods_number: [
          {
            required: true, message: '请输入商品数量',
            trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: true, message: '请选择商品分类',
            trigger: 'blur'
          }
        ]
      },
      // 所有商品分类的数据
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 图片要上传到的后台接口地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 上传图片组件的请求头
      headerObj: {
        Authorization:window.sessionStorage.getItem('token')
      },
      // 
      previewPath: '',
      // 控制图片预览对话框 的显示隐藏
      previewVisible: false,


 
    }
  },
    created() {
        this.getCateList()
    },
  methods: {
    // 获取所有商品分类的数据
    async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取失败')
        }
      this.catelist = res.data
      // console.log( this.catelist);
    },
    // 级联选择器选项变化会触发的函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
        // console.log(this.addForm.goods_cat);
    },
    // 切换标签之前的钩子   阻止标签页切换 return false
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' &&
        this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类')
          return false
        }
      
    },
    // 
    async tabClicked() {
      // console.log(this.activeIndex);
      // 证明访问的是动态参数
      if (this.activeIndex === '1') {
        const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          {
            params:{sel: 'many'}
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取失败')
        }
        // console.log(res.data);
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ?
            [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }
      // 证明访问的是静态属性
      else if (this.activeIndex === '2') {
        const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          {
            params:{sel: 'only'}
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取失败')
        }
        // console.log(res.data);
        this.onlyTableData = res.data
      }
      
    },
    //  图片预览事件
    handlePreview(file) {
      // console.log(file);
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 单击叉号时触发的函数(移除图片)
    handleRemove(file) {
      // console.log(file);
      // 1.获取到将要删除的图片临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics中找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(item => {
        return item.pic === filePath
      })
      // 3.调用数组的splice方法 将图片信息从pics中删除
      this.addForm.pics.splice(i, 1)
      // console.log(this.addForm);
    },
    // 上传图片成功后的勾子  response服务器返回时的对象
    handleSuccess(response) {
      // console.log(response);
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象 push 到pics数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm.pics);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项目')
        } 
        // 执行添加的业务逻辑
        // lodash cloneDeep(obj) 深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数和静态属性
        this.manyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form);
        // 发请求添加商品
        // 商品名称唯一
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加失败')
        }
        this.$message.success('添加成功')
        this.$router.push('/goods')
      })
    }
      
      
  },
  computed: {
    // 
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
      }
      return null
        
      }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>